node_modules/engine.io-parser/build/esm/encodePacket.js

import { PACKET_TYPES } from "./commons.js";
const encodePacket = ({ type, data }, supportsBinary, callback) => {
    if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
        const buffer = toBuffer(data);
        return callback(encodeBuffer(buffer, supportsBinary));
    }
    // plain string
    return callback(PACKET_TYPES[type] + (data || ""));
};
const toBuffer = data => {
    if (Buffer.isBuffer(data)) {
        return data;
    }
    else if (data instanceof ArrayBuffer) {
        return Buffer.from(data);
    }
    else {
        return Buffer.from(data.buffer, data.byteOffset, data.byteLength);
    }
};
// only 'message' packets can contain binary, so the type prefix is not needed
const encodeBuffer = (data, supportsBinary) => {
    return supportsBinary ? data : "b" + data.toString("base64");
};
export default encodePacket;